The DOC file format (document file format) usually has the .doc extension. Mostly these documents belong to MicrosoftWord software files. However, other text editing software can be used to display these files (including WordPad, WordPerfect, OpenOffice and others).

The OLE Compound File has no distinct footer and a can be considered a file containing a FAT like file system.

The Word document format is places on top of the OLE Compound File,.

The object stream of a word documents contains the string "Word.Document" with some version.

Encryption

Versions 97/2000 encrypt documents with a very weak algorithm. This password scheme can be broken easily by several different products and it is possible to decrypt the contents without discovering the password. This is done by testing all 1,099,511,627,776 possible keys. Ultimate Zip Cracker by VDGSoftware is one utility that can perform this decryption.